BirdAnalyst
Species · Connecticut · BBS 2026 Release · 1966–2025

House Finch Population Trend in Connecticut

All statesGeneralists

House Finch in Connecticut has surged: up 599% on the route-weighted index since 1969.

+599%Since 1969TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
20Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable House Finch Trends in ConnecticutNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

House Finch has surged in Connecticut: up 599% on the route-weighted index since 1969.

House Finch Population Forecast in Connecticut

If the recent trend holds, House Finch in Connecticut is projected to stay roughly flat through 2030, near 14 (95% range 0.00–31). A 5-year backtest shows a typical error of ±26.1%, with 100% of held-out values landing inside the 95% band.

+9%Change by 2030TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
14Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–3195% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±26.1%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, House Finch in Connecticut is projected to stay roughly flat through 2030, near 14 (95% range 0.00–31). A 5-year backtest shows a typical error of ±26.1%, with 100% of held-out values landing inside the 95% band.19672030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
2026140.0030
2027140.0031
2028140.0031
2029140.0031
2030140.0031

House Finch Survey Routes in Connecticut

Routes recording House Finch in Connecticut.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Mid Haddam2820251978
New Hartford2619871979
Willimantic2520181976
E Hartland2119921978
Uncasville2020251977
Southington2020251975
Westbrook1920251973
Warren1920111978
Danbury1820231968
Mystic1320231974
Buckingham1320221976
Granby1120251988
Long Hill820191972
Sherman620191978
Greenwich420181967
No Woodbury220251972
Woodstock 2220252017
Woodstock120071984
New Hartford120211994
Warren 2120252012

House Finch Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradodelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.